At a high-security Northrop Grumman facility in Palmdale, Calif., B-2 stealth bombers get meticulous makeovers once every seven years, at a cost of about $60 million per plane. The makeovers involve stripping off the plane's paint, panels, nuts and bolts and rebuilding with new paint and equipment, and using painstaking precision to make sure even the tiniest blemishes are not detectable on radar screens.

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